Viewing angle narrowing structure and display device having the same

ABSTRACT

A display device includes a first emitting area and a second emitting area which is spaced apart from the first emitting area, a first electrode facing a second electrode with a liquid crystal layer therebetween, each of the first electrode, the second electrode and the liquid crystal layer corresponding to the first emitting area, a third electrode facing a fourth electrode with a light emitting layer therebetween, each of the third electrode, the fourth electrode and the light emitting layer corresponding to the second emitting area, and the fourth electrode defining an opening in the fourth electrode which corresponds to the first emitting area.

This application claims priority to Korean Patent Application No.10-2022-0023026, filed on Feb. 22, 2022, and all the benefits accruingtherefrom under 35 U.S.C. § 119, the content of which in its entirety isherein incorporated by reference.

BACKGROUND (1) Field

Implementations of the invention relate generally to a display devicewhich adjusts a viewing angle.

(2) Description of the Related Art

A display device may include a display area displaying an image. Thedisplay device may have a wide viewing angle, and accordingly, the imagedisplayed on the display area may be viewable from various angles.

When the display device having the wide viewing angle is used in apublic place, privacy of an image being displayed may also be viewablefrom the various angles.

SUMMARY

When a display device having the wide viewing angle is used in a publicplace, privacy of an image being displayed may be exposed, owing to theimage being viewable from various angles. Accordingly, to protectprivacy of an image displayed by a display device, an improved displaydevice is desired in which a wide viewing angle mode in which the imageis displayed in a wide viewing angle, and a narrow viewing angle mode inwhich the image is displayed in a narrow viewing angle, are variouslyselectable.

Embodiments provide a display device which is selectively drivable in awide viewing angle mode or a narrow viewing angle mode.

A display device according to an embodiment may include a backlightunit, a liquid crystal layer on the backlight unit, a first electrodeunder the backlight unit, where at least a portion of the firstelectrode overlaps a first emitting area, a second electrode on thebacklight unit, where at least a portion of the second electrodeoverlaps the first emitting area, a third electrode on the secondelectrode, where at least a portion of the third electrode overlaps asecond emitting area adjacent to the first emitting area, a pixeldefining layer on the third electrode and defining a first openingexposing a portion of the third electrode and overlapping the secondemitting area, a light emitting layer in the first opening, and a fourthelectrode on the light emitting layer and defining a second openingoverlapping the first emitting area.

In an embodiment, the display device may further include a barrierpattern disposed to overlap the first emitting area.

In an embodiment, the barrier pattern may include a first barrierpattern between the second electrode and the pixel defining layer.

In an embodiment, the pixel defining layer may define a third openingoverlapping the first emitting area.

In an embodiment, the barrier pattern may include a second barrierpattern in the third opening.

In an embodiment, the barrier pattern may include a third barrierpattern between the backlight unit and the first electrode.

In an embodiment, the barrier pattern may include a plurality of firstbarrier patterns extending in a first direction and arranged in a seconddirection which crosses the first direction.

In an embodiment, the barrier pattern may further include a plurality ofsecond barrier patterns extending in the second direction and arrangedin the first direction.

In an embodiment, the backlight unit may emit straight light.

In an embodiment, the display device may further include a middlesubstrate between the second electrode and the third electrode, andincluding a driving transistor electrically connected to the thirdelectrode.

In an embodiment, the middle substrate may define a groove overlappingthe first emitting area and through which the straight light passes andremains straight.

In an embodiment, the display device may further include a color filterlayer on the fourth electrode and overlapping the first emitting areaand the second emitting area.

A display device according to an embodiment may include a firstelectrode, where at least a portion of the first electrode overlaps afirst emitting area, a first pixel defining layer on the firstelectrode, and defining a first opening exposing a portion of the firstelectrode and overlapping the first emitting area, a first lightemitting layer in the first opening, a second electrode on the firstlight emitting layer, a third electrode on the second electrode, whereat least a portion of the third electrode overlaps a second emittingarea adjacent to the first emitting area, a second pixel defining layeron the third electrode, and defining a second opening exposing a portionof the third electrode and overlapping the second emitting area, asecond light emitting layer in the second opening, and a fourthelectrode on the second light emitting layer, and defining a thirdopening overlapping the first emitting area.

In an embodiment, the display device may further include a barrierpattern disposed to overlap the first emitting area.

In an embodiment, the barrier pattern may include a first barrierpattern between the second electrode and the second pixel defininglayer.

In an embodiment, the second pixel defining layer may define a fourthopening overlapping the first emitting area.

In an embodiment, the barrier pattern may include a second barrierpattern in the fourth opening.

In an embodiment, the barrier pattern may include a plurality of firstbarrier patterns extending in a first direction and arranged in a seconddirection which crosses the first direction.

In an embodiment, the barrier pattern may further include a plurality ofsecond barrier patterns extending in the second direction and arrangedin the first direction.

In an embodiment, the display device may further include a color filterlayer on the fourth electrode, and overlapping the first emitting areaand the second emitting area.

The display device according to an embodiment may include a backlightunit, a liquid crystal layer on the backlight unit, a first electrodeunder the backlight unit, where at least a portion of the firstelectrode overlaps a first emitting area, a second electrode on thebacklight unit, where at least a portion of the second electrodeoverlaps the first emitting area, a third electrode on the secondelectrode, where at least a portion of the third electrode overlaps asecond emitting area adjacent to the first emitting area, a pixeldefining layer on the third electrode and defining a first openingexposing a portion of the third electrode and overlapping the secondemitting area, a light emitting layer in the first opening, and a fourthelectrode on the light emitting layer and defining a second openingoverlapping the first emitting area. Accordingly, an image having anarrow viewing angle may be displayed in the first emitting area, and animage having a wide viewing angle may be displayed in the secondemitting area.

The display device according to an embodiment may include a firstelectrode, where at least a portion of the first electrode overlaps afirst emitting area, a first pixel defining layer on the firstelectrode, and defining a first opening exposing a portion of the firstelectrode and overlapping the first emitting area, a first lightemitting layer in the first opening, a second electrode on the firstlight emitting layer, a third electrode on the second electrode, whereat least a portion of the third electrode overlaps a second emittingarea adjacent to the first emitting area, a second pixel defining layeron the third electrode, and defining a second opening exposing a portionof the third electrode and overlapping the second emitting area, asecond light emitting layer in the second opening, and a fourthelectrode on the second light emitting layer, and defining a thirdopening overlapping the first emitting area. Accordingly, an imagehaving a narrow viewing angle may be displayed in the first emittingarea, and an image having a wide viewing angle may be displayed in thesecond emitting area.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this specification, illustrate embodiments of the inventiontogether with the description.

FIG. 1 and FIG. 2 are plan views illustrating a display area of adisplay device according to an embodiment.

FIG. 3 is a cross-sectional view illustrating an embodiment of astructure of a pixel included in the display device.

FIG. 4 is an enlarged cross-sectional view of area A of FIG. 3 .

FIG. 5 is a cross-sectional view illustrating an embodiment of astructure of a pixel included in the display device.

FIG. 6 is a cross-sectional view illustrating an embodiment of astructure of a pixel included in the display device.

FIG. 7 is a cross-sectional view illustrating an embodiment of astructure of a pixel included in the display device.

FIG. 8 is a plan view illustrating a display area of a display deviceaccording to an embodiment.

FIG. 9 is a cross-sectional view illustrating an embodiment of astructure of a pixel included in the display device.

FIG. 10 is a plan view illustrating a display area of a display deviceaccording to an embodiment.

FIG. 11 is a cross-sectional view illustrating an embodiment of astructure of a pixel included in the display device.

FIG. 12 is a cross-sectional view illustrating an embodiment of astructure of a pixel included in the display device.

DETAILED DESCRIPTION

The invention now will be described more fully hereinafter withreference to the accompanying drawings, in which various embodiments areshown. This invention may, however, be embodied in many different forms,and should not be construed as limited to the embodiments set forthherein. Rather, these embodiments are provided so that this disclosurewill be thorough and complete, and will fully convey the scope of theinvention to those skilled in the art.

Like reference numerals refer to like elements throughout. As usedherein, a reference number may indicate a singular element or aplurality of the element. For example, a reference number labeling asingular form of an element within the drawing figures may be used toreference a plurality of the singular element within the text ofspecification.

It will be understood that when an element is referred to as beingrelated to another element such as being “on” another element, it can bedirectly on the other element or intervening elements may be presenttherebetween. In contrast, when an element is referred to as beingrelated to an element such as being “directly on” another element, thereare no intervening elements present.

It will be understood that, although the terms “first,” “second,”“third” etc. may be used herein to describe various elements,components, regions, layers and/or sections, these elements, components,regions, layers and/or sections should not be limited by these terms.These terms are only used to distinguish one element, component, region,layer or section from another element, component, region, layer orsection. Thus, “a first element,” “component,” “region,” “layer” or“section” discussed below could be termed a second element, component,region, layer or section without departing from the teachings herein.

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting. As used herein,“a”, “an,” “the,” and “at least one” do not denote a limitation ofquantity, and are intended to include both the singular and plural,unless the context clearly indicates otherwise. For example, “anelement” has the same meaning as “at least one element,” unless thecontext clearly indicates otherwise. “At least one” is not to beconstrued as limiting “a” or “an.” “Or” means “and/or.” As used herein,the term “and/or” includes any and all combinations of one or more ofthe associated listed items. It will be further understood that theterms “comprises” and/or “comprising,” or “includes” and/or “including”when used in this specification, specify the presence of statedfeatures, regions, integers, steps, operations, elements, and/orcomponents, but do not preclude the presence or addition of one or moreother features, regions, integers, steps, operations, elements,components, and/or groups thereof.

Furthermore, relative terms, such as “lower” or “bottom” and “upper” or“top,” may be used herein to describe one element's relationship toanother element as illustrated in the Figures. It will be understoodthat relative terms are intended to encompass different orientations ofthe device in addition to the orientation depicted in the Figures. Forexample, if the device in one of the figures is turned over, elementsdescribed as being on the “lower” side of other elements would then beoriented on “upper” sides of the other elements. The term “lower,” cantherefore, encompasses both an orientation of “lower” and “upper,”depending on the particular orientation of the figure. Similarly, if thedevice in one of the figures is turned over, elements described as“below” or “beneath” other elements would then be oriented “above” theother elements. The terms “below” or “beneath” can, therefore, encompassboth an orientation of above and below.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this disclosure belongs. It willbe further understood that terms, such as those defined in commonly useddictionaries, should be interpreted as having a meaning that isconsistent with their meaning in the context of the relevant art and thepresent disclosure, and will not be interpreted in an idealized oroverly formal sense unless expressly so defined herein.

Embodiments are described herein with reference to cross sectionillustrations that are schematic illustrations of idealized embodiments.As such, variations from the shapes of the illustrations as a result,for example, of manufacturing techniques and/or tolerances, are to beexpected. Thus, embodiments described herein should not be construed aslimited to the particular shapes of regions as illustrated herein butare to include deviations in shapes that result, for example, frommanufacturing. For example, a region illustrated or described as flatmay, typically, have rough and/or nonlinear features. Moreover, sharpangles that are illustrated may be rounded. Thus, the regionsillustrated in the figures are schematic in nature and their shapes arenot intended to illustrate the precise shape of a region and are notintended to limit the scope of the present claims.

Illustrative, non-limiting embodiments will be more clearly understoodfrom the following detailed description in conjunction with theaccompanying drawings.

FIG. 1 and FIG. 2 are plan views illustrating a display area DA of adisplay device according to an embodiment. The display area DA mayextend along a plane defined by a first direction D1 and a seconddirection D2 crossing each other. A thickness direction of components orlayers of the display device may be extended along a third directioncrossing the first direction D1 and the second direction D2.

Referring to FIG. 1 , a plurality of pixels may be disposed in a displayarea DA. The plurality of pixels may include a first pixel PXR, a secondpixel PRG, and a third pixel PXB. The first pixel PXR may be a pixelemitting red light, the second pixel PXG may be a pixel emitting greenlight, and the third pixel PXB may be a pixel emitting blue light. Theplurality of pixels may be arranged in a first direction D1 and a seconddirection D2 crossing the first direction D1. A plurality of pixels maybe disposed within a pixel area PXA.

Each of the plurality of pixels may include a first emitting area (e.g.,first light emitting area) and a second emitting area (e.g., a secondlight emitting area). For example, the first pixel PXR may include firstand second emitting areas R1 and R2, the second pixel PXG may includefirst and second emitting areas G1 and G2, and the third pixel PXB mayinclude first and second emitting areas B1 and B2.

The first emitting area may be an area emitting light having arelatively narrow viewing angle, that is, a planar area at which lighthaving the relatively narrow viewing angle is emitted. In an embodiment,a first barrier pattern 110 having a plurality of patterns arranged in(or along) the first direction D1, and extending in the second directionD2, may be disposed in the first emitting area. The first barrierpattern 110 may limit a viewing angle of light emitted from the firstemitting area in the first direction D1. That is, respective patterns ofthe first barrier pattern 110 may limit a viewing angle of light emittedin a same direction in which the patterns are arranged. The secondemitting area may be an area emitting light having a relatively wideviewing angle.

In an embodiment, when a display device is driven in a narrow viewingangle mode, light may be emitted from the first emitting area having thenarrow viewing angle, and light may not be emitted from the secondemitting area having the wide viewing angle which is wider than thenarrow viewing angle along a same direction.

In an embodiment, when the display device is driven in a wide viewingangle mode, light may not be emitted from the first emitting area havingthe narrow viewing angle, and light may be emitted from the secondemitting area having the wide viewing angle which is wider than thenarrow viewing angle. In an embodiment, when the display device isdriven in the wide viewing angle mode having the wide viewing anglewhich is wider than the narrow viewing angle, light may be emitted fromeach of the first emitting area having the narrow viewing angle and thesecond emitting area having the wide viewing angle.

Referring to FIG. 2 , components disposed in a display area DA shown inFIG. 2 may be substantially same as the components disposed in thedisplay area DA shown in FIG. 1 , except for shape of the first barrierpattern 110 disposed in the first emitting area.

For example, as shown in FIG. 2 , the first barrier pattern 110 mayinclude a plurality of patterns arranged and extended in directionsdifferent from each other. The first barrier pattern 110 may include avertical barrier pattern provided in plural arranged in the firstdirection D1 and extending in the second direction D2, and a horizontalbarrier pattern provided in plural arranged in the second direction D2and extending in the first direction D1. Accordingly, the first barrierpattern 110 may limit a viewing angle of light emitted from the firstemitting area in both the first direction D1 and the second directionD2.

Planar shape of the first barrier pattern 110 is not limited to theplanar shapes of the first barrier pattern 110 illustrated in FIG. 1 andFIG. 2 . The first barrier pattern 110 may have any planar shape capableof limiting a viewing angle of light emitted from the first emittingarea. For example, the first barrier pattern 110 may have circular orpolygonal planar shape.

FIG. 3 is a cross-sectional view of a structure of a pixel included inthe display device according to an embodiment. FIG. 3 is across-sectional view of a display device along line I-I′ of FIG. 2 .

Referring to FIG. 3 , the first pixel PXR may include a backlight unitBLU, a first base substrate BS1, a first polarization layer POL1, afirst insulation layer IL1, a second insulation layer IL2, a liquidcrystal layer LC, a first buffer layer BUF, a second polarization layerPOL2, a second buffer layer BUF2, a second base substrate BS2, a thirdinsulation layer IL3, a fourth insulation layer IL4, a fifth insulationlayer IL5, a pixel defining layer PDL, a light emitting layer EL, anencapsulation layer EN, a color filter layer CF, a first active layerATV1, a first gate electrode GE1, a first source-drain electrode SDE1, afirst electrode E1, a second electrode E2, a second active layer ATV2, asecond gate electrode GE2, a second source-drain electrode SDE2, a thirdelectrode E3, a fourth electrode E4, and a first barrier pattern layer100.

The backlight unit BLU may include a material which emits light. Forexample, the backlight unit BLU may include a light emitting diode(LED). The backlight unit BLU may emit light in a direction toward theliquid crystal layer LC, e.g., a light emitting direction. The backlightunit BLU may emit light and provide the light to the liquid crystallayer LC.

The first base substrate BS1 may be disposed on the backlight unit BLU.The first base substrate BS1 may include a transparent material throughwhich light emitting from the backlight unit BLU passes in the lightemitting direction. For example, the first base substrate BS1 mayinclude glass, plastic, etc.

The first polarization layer POL1 may be disposed on the first basesubstrate BS1. The first polarization layer POL1 may polarize lightemitted from the backlight unit BLU.

The first gate electrode GE1 may be disposed on the first polarizationlayer POL1. The first gate electrode GE1 may include a conductivematerial.

The first insulation layer IL1 may be disposed on the first polarizationlayer POL1. The first insulation layer IL1 may cover the first gateelectrode GE1.

The first active layer ATV1 may be disposed on the first insulationlayer IL1. The first active layer ATV1 may include semiconductormaterial.

The first source-drain electrode SDE1 may be disposed on the firstactive layer ATV1. The first source-drain electrode SDE1 mayelectrically contact at least a portion of the first active layer ATV1.The first gate electrode GE1, the first active layer ATV1, and the firstsource-drain electrode SDE1 may define a first driving transistor.

The second insulation layer IL2 may be disposed on the first insulationlayer ILL The second insulation layer IL2 may cover the first activelayer ATV1 and the first source-drain electrode SDE1.

The first electrode E1 may be disposed on the second insulation layerIL2. The first electrode E1 may electrically contact the firstsource-drain electrode SDE1, that is, may be electrically connected tothe first driving transistor at the first source-drain electrode SDE1.At least a portion of the first electrode E1 may overlap (or correspondto) the first emitting area R1, along the thickness direction of thedisplay device. In an embodiment, the first electrode E1 may not overlapthe second emitting area R2. As not overlapping, elements may beadjacent to each other or spaced apart from each other along a planardirection (e.g., along the plane defined by the first direction D1 andthe second direction D2 crossing each other, along an underlying layersuch as a substrate or insulating layer like the first base substrateBS1, the first insulation layer IL1, etc.).

The liquid crystal layer LC may be disposed on the first electrode E1.The liquid crystal layer LC may change a phase of light passing throughthe layer, according to electrical signals of the first electrode E1 andthe second electrode E2 facing each other with the liquid crystal layerLC therebetween.

The second electrode E2 may be disposed on the liquid crystal layer LC.At least a portion of the second electrode E2 may overlap the firstemitting area R1. In an embodiment, the second electrode E2 may notoverlap the second emitting area R2. A collection of layers includingthe first electrode E1, the second electrode E2 facing the firstelectrode E1, and the liquid crystal layer LC between the firstelectrode E1 and the second electrode E2 which face each other, maydefine a first light emitting element. Alternatively, the backlight unitBLU with or without the collection of layers of the first electrode E1,the second electrode E2 and the liquid crystal layer LC, may define thefirst light emitting element.

The first buffer layer BUF may be disposed on the liquid crystal layerLC. The first buffer layer BUF may cover the second electrode E2. Thefirst buffer layer BUF may include an inorganic insulation material.

The second polarization layer POL2 may be disposed on the first bufferlayer BUF. The second polarization layer POL2 may selectively transmitlight having a specific phase among light passing through the liquidcrystal layer LC.

The second buffer layer BUF2 may be disposed on the second polarizationlayer POL2. The second buffer layer BUF2 may include an inorganicinsulation material.

The second base substrate BS2 may be disposed on the second buffer layerBUF2. The second base substrate BS2 may include a transparent material.For example, the second base substrate BS2 may include glass, plastic,etc.

The second active layer ATV2 may be disposed on the second basesubstrate BS2. The second active layer ATV2 may include semiconductormaterial.

The third insulation layer IL3 may be disposed on the second basesubstrate BS2. The third insulation layer IL3 may cover the secondactive layer ATV2.

The second gate electrode GE2 may be disposed on the third insulationlayer IL3. The second gate electrode GE2 may include a conductivematerial.

The fourth insulation layer IL4 may be disposed on the third insulationlayer IL3. The fourth insulation layer IL4 may cover the second gateelectrode GE2.

The second source-drain electrode SDE2 may be disposed on the fourthinsulation layer IL4. The second source-drain electrode SDE2 mayelectrically contact at least a portion of the second active layer ATV2.The second active layer ATV2, the second gate electrode GE2, and thesecond source-drain electrode SDE2 may define a second drivingtransistor.

The fifth insulation layer IL5 may be disposed on the fourth insulationlayer IL4. The fifth insulation layer IL5 may cover the secondsource-drain electrode SDE2.

The third electrode E3 may be disposed on the fifth insulation layerIL5. The third electrode E3 may electrically contact the secondsource-drain electrode SDE2.

The pixel defining layer PDL may be disposed on the fifth insulationlayer IL5. The pixel defining layer PDL may define a first openingexposing at least a portion of the third electrode E3 to outside thepixel defining layer PDL. The first opening may overlap the secondemitting area R2.

The light emitting layer EL may be disposed on the third electrode E3 inthe first opening. The light emitting layer EL may also extend frominside the first opening to be disposed extended along a sidewall of thepixel defining layer PDL and along an upper surface of the pixeldefining layer PDL. The light emitting layer EL may be disposed tooverlap the first emitting area R1 and the second emitting area R2. Inan embodiment, the light emitting layer EL may include an organic lightemitting material. In this case, the light emitting layer EL may furtherinclude at least one of electron injection layer, electron transportlayer, hole injection layer, and a hole transport layer.

The fourth electrode E4 may be disposed on the light emitting layer EL.The fourth electrode E4 may define a second opening overlapping thefirst emitting area R1. A collection of layers including the thirdelectrode E3, the fourth electrode E4 facing the third electrode E3, andthe emitting layer EL between the third electrode E3, the fourthelectrode E4 which face each other, may define a second light emittingelement.

The encapsulation layer EN may be disposed on the fourth electrode E4.In an embodiment, the encapsulation layer EN may include a firstinorganic encapsulation layer, an organic encapsulation layer, and asecond inorganic encapsulation layer sequentially stacked.

The color filter layer CF may be disposed on the encapsulation layer EN.The color filter layer CF may selectively transmit light of a specificwavelength.

The first barrier pattern layer 100 may be disposed to overlap the firstemitting area R1. The first barrier pattern layer 100 may be disposedbetween the second base substrate BS2 and the pixel defining layer PDL.For example, as shown in FIG. 3 , the first barrier pattern layer 100may be disposed on the fourth insulation layer IL4 to penetrate thefifth insulation layer IL5. The first barrier pattern layer 100 togetherwith a solid portion of the fifth insulation layer IL5 may togetherdefine a barrier pattern layer.

The first barrier pattern layer 100 may include the first barrierpattern 110. Light emitted from the backlight unit BLU and passingthrough the liquid crystal layer LC may pass through the first barrierpattern 110 to have a relatively narrow viewing angle. Accordingly, animage having a narrow viewing angle may be displayed in (or at) thefirst emitting area R1.

FIG. 3 illustrates an embodiment which the first barrier pattern layer100 penetrates the fifth insulation layer IL5 and is formed on thefourth insulation layer IL4, but the invention is not limited thereto.The first barrier pattern layer 100 may be disposed at various positionsdisposed between the pixel defining layer PDL and the second basesubstrate BS2 and overlapping the first emitting area R1. For example,the first barrier pattern layer 100 may penetrate the fourth insulationlayer IL4 and/or the third insulation layer IL3 and may be disposed onthe second base substrate BS2.

FIG. 4 is a cross-sectional view of enlarged area A of FIG. 3 .

Referring to FIG. 4 , the first barrier pattern layer 100 may includethe first barrier pattern 110 and an organic layer OL.

The first barrier pattern 110 may be disposed substantiallyperpendicular to an upper surface of the fourth insulation layer IL4.The first barrier pattern 110 may include a light blocking material. Forexample, the first barrier pattern 110 may include an inorganicinsulation material having a relatively large light absorption.

The organic layer OL may be disposed adjacent to patterns of the firstbarrier pattern 110. The organic layer OL may include an organicmaterial having a relatively large light transmittance.

Referring to FIGS. 3 and 4 , the first barrier pattern 110 may include aplurality of barrier walls, to define a barrier wall pattern. Each ofthe barrier walls may be protruded from the upper surface of the fourthinsulation layer IL4, such as being perpendicular thereto. Referring toFIGS. 3 and 4 , taken with FIG. 2 (or FIG. 1 ), each of the plurality ofbarrier walls within the barrier wall pattern may have a bar shape in aplan view (e.g., a planar shape). The bar shape may extend along theplane defined by the first and second directions D1 and D2 crossing eachother, where a length of the bar shape extends along the first directionD1 and a width of the bar shape extends along the second direction D2.

In an embodiment, each of the barrier patterns (or barrier walls) of thefirst barrier pattern 110 may include a lower barrier pattern 111 and anupper barrier pattern 112, and the organic layer OL may include a firstorganic layer OL1, a second organic layer OL2, and a third organic layerOL3. The lower barrier pattern 111 and the upper barrier pattern 112 mayeach be provided in plural including a plurality of lower barrierpatterns 111 corresponding to a plurality of upper barrier patterns 112.A lower barrier pattern 111 and an upper barrier pattern 112 maytogether form a barrier wall. In an embodiment, a single one of thelower barrier pattern 111 or a single one of the upper barrier pattern112 may form a barrier wall.

The first barrier pattern 110 may contact a side surface of the firstorganic layer OL1. As being in contact, elements may form an interfacetherebetween, without being limited thereto. In an embodiment, forming(or providing) the lower barrier pattern 111 may include forming thefirst organic layer OL1 on the fourth insulation layer IL4, forming ainorganic insulation material covering the fourth insulation layer IL4and the first organic layer OL1, and etching the inorganic insulationmaterial to provide a plurality of lower barrier patterns 111 spacedapart from each other along the fourth insulation layer IL4. In thiscase, in the etching the inorganic insulation material, a portion of theinorganic insulation material may be removed by anisotropic dry etching,and accordingly, a residue of the inorganic insulation material may formthe lower barrier pattern 111.

A portion of the upper barrier pattern 112 may be disposed on the lowerbarrier pattern 111, and the upper barrier pattern 112 may contact aside surface of the second organic layer OL2. In an embodiment, afterforming the lower barrier pattern 111, forming the upper barrier pattern112 may include forming the second organic layer OL2 on the fourthinsulation layer IL4, forming an inorganic insulation material coveringthe fourth insulation layer IL4 and the second organic layer OL2, andetching the inorganic insulation material to provide a plurality ofupper barrier patterns 112 spaced apart from each other along the fourthinsulation layer IL4. In this case, in the etching the inorganicinsulation material, a portion of the inorganic insulation material maybe removed by anisotropic dry etching, and accordingly, a residue of theinorganic insulation material may form the upper barrier pattern 112.

The third organic layer OL3 may be disposed on the first organic layerOL1. The third organic layer OL3 together with the first organic layerOL1 may together form an organic layer pattern between the plurality ofbarrier walls within the first barrier pattern 110. In an embodiment,after forming the upper barrier pattern 112, the third organic layer OL3may be formed on the first organic layer OL1.

FIG. 4 shows an embodiment in which a barrier wall of the first barrierpattern 110 includes the lower barrier pattern 111 and the upper barrierpattern 112, but the invention is not limited thereto. For example, abarrier wall of the first barrier pattern 110 may include three barrierpatterns sequentially stacked to be substantially perpendicular to theupper surface of the fourth insulation layer IL4.

FIG. 5 is a cross-sectional view illustrating an embodiment of astructure of a pixel included in the display device according to anembodiment. Description substantially same or similar to the descriptionwith reference to FIG. 3 may be omitted.

Referring to FIG. 5 , in the first emitting area R1, the light emittinglayer EL may be omitted. Accordingly, light emitted from the backlightunit BLU and sequentially passing through the liquid crystal layer LCand the first barrier pattern layer 100 may not pass through the lightemitting layer EL. That is, the light emitting layer EL may include aplurality of fourth openings. A fourth opening may expose the firstbarrier pattern layer 100 to outside the light emitting layer EL.

FIG. 6 is a cross-sectional view illustrating an embodiment of astructure of a pixel included in the display device according to anembodiment. Description substantially same or similar to the descriptionwith reference to FIG. 3 may be omitted.

Referring to FIG. 6 , the pixel defining layer PDL may define a thirdopening overlapping the first emitting area R1. In this case, a secondbarrier pattern layer 200 may be disposed in the third opening. Thesecond barrier pattern layer 200 may include a second barrier pattern210. The second barrier pattern layer 200 and the second barrier pattern210 may be substantially same as the first barrier pattern layer 100 andthe first barrier pattern 110 described with reference to FIG. 3 andFIG. 4 . Accordingly, a viewing angle of light emitted from thebacklight unit BLU and passing through the liquid crystal layer LC maybe adjusted by the second barrier pattern 210, and an image having anarrow viewing angle may be displayed in the first emitting area R1.

FIG. 7 is a cross-sectional view illustrating an embodiment of astructure of a pixel included in the display device according to anembodiment. Description substantially same or similar to the descriptionwith reference to FIG. 3 may be omitted.

Referring to FIG. 7 , a third barrier pattern layer 300 may be disposedbetween the backlight unit BLU and the first base substrate BS1. Thethird barrier pattern layer 300 may include a third barrier pattern 310.The third barrier pattern layer 300 may overlap the first emitting areaR1. The third barrier pattern layer 300 and the third barrier pattern310 may be substantially same as the first barrier pattern layer 100 andthe first barrier pattern 110 described with reference to FIG. 3 andFIG. 4 . Accordingly, a viewing angle of light emitted from thebacklight unit BLU and passing through the liquid crystal layer LC maybe adjusted by the third barrier pattern 310, and an image having anarrow viewing angle may be displayed in the first emitting area R1.

FIG. 8 is a plan view illustrating a display area DA′ of a displaydevice according to an embodiment.

Referring to FIG. 8 , a plurality of pixels may be disposed in a displayarea DA′. The plurality of pixels may include a first pixel PXR′, asecond pixel PXG′, and a third pixel PXB′. The first pixel PXR′ may be apixel emitting red light, the second pixel PXG′ may be a pixel emittinggreen light, and the third pixel PXB′ may be a pixel emitting bluelight. The plurality of pixels may be arranged in a first direction D1and a second direction D2 crossing the first direction D1.

Each of the plurality of pixels may include a first emitting area and asecond emitting area. For example, the first pixel PXR′ may includefirst and second emitting areas R1′ and R2′, the second pixel PXG′ mayinclude first and second emitting areas G1′ and G2′, and the third pixelPXB′ may include first and second emitting areas B1′ and B2′.

The first emitting area may be an area emitting light having arelatively narrow viewing angle. The second emitting area may be an areaemitting light having a relatively wide viewing angle.

In an embodiment, when a display device is driven in a narrow viewingangle mode, light may be emitted from the first emitting area, and lightmay not be emitted from the second emitting area.

In an embodiment, when the display device is driven in a wide viewingangle mode, light may not be emitted from the first emitting area, andlight may be emitted from the second emitting area. In an embodiment,when the display device is driven in the wide viewing angle mode, lightmay be emitted from each of the first emitting area and the secondemitting area.

FIG. 9 is a cross-sectional view illustrating an embodiment of astructure of a pixel included in the display device according to anembodiment. Description substantially same or similar to the descriptionwith reference to FIG. 3 may be omitted. FIG. 9 is a cross-sectionalview of a display device along line II-II′ of FIG. 8 .

Referring to FIG. 9 , the first pixel PXR′ may include a backlight unitBLU′, a first base substrate BS1′, a first polarization layer POL1′, afirst insulation layer IL1′, a second insulation layer IL2′, a liquidcrystal layer LC′, a first buffer layer BUF′, a second polarizationlayer POL2′, a second buffer layer BUF2′, a second base substrate BS2′,a third insulation layer IL3′, a fourth insulation layer IL4′, a fifthinsulation layer IL5′, a pixel defining layer PDL′, a light emittinglayer EL′, an encapsulation layer EN′, a color filter layer CF′, a firstactive layer ATV1′, a first gate electrode GE1′, a first source-drainelectrode SDE1′, a first electrode E1′, a second electrode E2′, a secondactive layer ATV2′, a second gate electrode GE2′, a second source-drainelectrode SDE2′, a third electrode E3′, and a fourth electrode E4′.

Light emitted from the backlight unit BLU′ may have a light emittingdirection of a straight light. The straight light may be light travelingin a direction substantially perpendicular to the first direction D1 (inFIG. 1 and FIG. 2 ) and the second direction D2 (in FIG. 1 and FIG. 2 )

In this case, a middle substrate defined by the second buffer layerBUF2′, the second base substrate BS2′, the third insulation layer IL3′,the fourth insulation layer IL4′, and the fifth insulation layer IL5′together with each other, may define a groove GR overlapping the firstemitting area R1′. Respective openings in the above layers may bealigned with each other to form the groove GR. In an embodiment, whenthe pixel defining layer PDL′ defines a third opening overlapping thefirst emitting area R1′, the third opening may overlap the groove GR.That is, the respective openings in the middle substrate and the pixeldefining layer PDL may together define the groove GR.

The straight light emitted from the backlight unit BLU′ may sequentiallypass through the liquid crystal layer LC′ and the middle substrate atthe groove GR, to remain straight and be emitted as straight light atthe first emitting area R1′. Accordingly, an image having a narrowviewing angle may be displayed in the first emitting area R1′. Since aportion of layers following the second polarization layer POL2′, andbetween the encapsulation layer EN′ and the second polarization layerPOL2′ is omitted to form the groove GR, light transmission is notinhibited at the groove GR, and the straight light may continue from thesecond polarization layer POL2′ and through the encapsulation layer EN′to provide the narrow viewing angle at the first emitting area R1′.

FIG. 10 is a plan view illustrating a display area DA″ of a displaydevice according to an embodiment.

Referring to FIG. 10 , a plurality of pixels may be disposed in adisplay area DA″. The plurality of pixels may include a first pixelPXR″, a second pixel PRG″, and a third pixel PXB″. The first pixel PXR″,the second pixel PXG″, and a third pixel PXB″ may be substantially sameas the first pixel PXR, the second pixel PXG, and a third pixel PXBdescribed with reference to FIG. 1 and FIG. 2 .

Each of the plurality of pixels may include a first emitting area and asecond emitting area. For example, the first pixel PXR″ may includefirst and second emitting areas R1″ and R2″, the second pixel PXG″ mayinclude first and second emitting areas G1″ and G2″, and the third pixelPXB″ may include first and second emitting areas B1″ and B2″. Aplurality of pixels may be disposed within a pixel area PXA″.

The first emitting area may be an area emitting light having arelatively narrow viewing angle. In an embodiment, a first barrierpattern 110″ may be disposed in the first emitting area. The firstbarrier pattern 110″ may be substantially same as the first barrierpattern 110 described with reference to FIG. 2 .

In an embodiment, when a display device is driven in a narrow viewingangle mode, light may be emitted from the first emitting area, and lightmay not be emitted from the second emitting area.

In an embodiment, when the display device is driven in a wide viewingangle mode, light may not be emitted from the first emitting area, andlight may be emitted from the second emitting area. In an embodiment,when the display device is driven in the wide viewing angle mode, lightmay be emitted from each of the first emitting area and the secondemitting area.

Planar shape of the first barrier pattern 110″ is not limited to theplanar shape of the first barrier pattern 110″ illustrated in FIG. 10 .The first barrier pattern 110″ may have any planar shape capable oflimiting a viewing angle of light emitted from the first emitting area.For example, the first barrier pattern 110″ may have circular orpolygonal planar shape.

FIG. 11 is a cross-sectional view illustrating an embodiment of astructure of a pixel included in the display device according to anembodiment. FIG. 11 is a cross-sectional view of a display device alongline III-III′ of FIG. 10 .

Referring to FIG. 11 , the first pixel PXR″ may include a first basesubstrate BS1″, a first insulation layer IL1″, a second insulation layerIL2″, a third insulation layer IL3″, a first pixel defining layer PDL1″,a first light emitting layer EL1″, a first encapsulation layer EN1″, afirst buffer layer BUF″, a light blocking layer LBL″, a second basesubstrate BS2″, a fourth insulation layer IL4″, a fifth insulation layerIL5″, a sixth insulation layer IL6″, a second pixel defining layerPDL2″, a second light emitting layer EL2″, a second encapsulation layerEN2″, a color filter layer CF″, a first active layer ATV1″, a first gateelectrode GE1″, a first source-drain electrode SDE1″, a first electrodeE1″, a second electrode E2″, a second active layer ATV2″, a second gateelectrode GE2″, a second source-drain electrode SDE2″, a third electrodeE3″, and a fourth electrode E4″.

The first base substrate BS1″ may include a transparent material. Forexample, the first base substrate BS1″ may include glass, plastic, etc.

The first active layer ATV1″ may be disposed on the first base substrateBS1″. The first active layer ATV1″ may include a semiconductor material.

The first insulation layer IL1″ may be disposed on the first basesubstrate BS1″. The first insulation layer IL1″ may cover the firstactive layer ATV1″.

The first gate electrode GE1″ may be disposed on the first insulationlayer IL1″. The first gate electrode GE1″ may include a conductivematerial.

The second insulation layer IL2″ may be disposed on the first insulationlayer IL1″. The second insulation layer IL2″ may cover the first gateelectrode GE1″.

The first source-drain electrode SDE1″ may be disposed on the secondinsulation layer IL2″. The first source-drain electrode SDE1″ mayelectrically contact the first active layer ATV1″. The first activelayer ATV1″, the first gate electrode GE1″, and the first source-drainelectrode SDE1″ may define a first driving transistor.

The third insulation layer IL3″ may be disposed on the second insulationlayer IL2″. The third insulation layer IL3″ may cover the firstsource-drain electrode SDE1″.

The first electrode E1″ may be disposed on the third insulation layerIL3″. The first electrode E1″ may electrically contact the firstsource-drain electrode SDE1″. At least a portion of the first electrodeE1″ may overlap the first emitting area R1″.

The first pixel defining layer PDL1″ may be disposed on the firstelectrode E1″. The first pixel defining layer PDL1″ may define a firstopening exposing a portion of the first electrode E1″. The first openingmay overlap the first emitting area R1″.

The first light emitting layer EL1″ may be disposed in the firstopening. In an embodiment, the first light emitting layer EL1″ mayinclude an organic light emitting material.

The second electrode E2″ may be disposed on the first light emittinglayer EL1″. A collection of layers including the first electrode E1″,the second electrode E2″ facing the first electrode E1″, and the firstlight emitting layer EL1″ between the first electrode E1″ and the secondelectrode E2″ which face each other, may define a first light emittingelement.

The first encapsulation layer EN1″ may be disposed on the secondelectrode E2″. In an embodiment, the first encapsulation layer EN1″ mayinclude a first inorganic encapsulation layer, an organic encapsulationlayer, and a second inorganic encapsulation layer sequentially stacked.

The first buffer layer BUF″ may be disposed on the first encapsulationlayer EN1″. The first buffer layer BUF″ may include an insulatingmaterial.

The second base substrate BS2″ may be disposed on the first buffer layerBUF″. The second base substrate BS2″ may include a transparent material.For example, the second base substrate BS2″ may include glass, plastic,etc.

The light blocking layer LBL″ may be disposed on the first buffer layerBUF″. The light blocking layer LBL″ may define an opening overlap thefirst emitting area R1″. The light blocking layer LBL″ may block aportion of light emitted from the first light emitting layer EL1″ sothat the light emitted from the first light emitting layer EL1″ does notproceed to the second emitting area R2″. In an embodiment, the lightblocking layer LBL″ may be omitted.

The second active layer ATV2″ may be disposed on the second basesubstrate BS2″. The second active layer ATV2″ may include asemiconductor material.

The fourth insulation layer IL4″ may be disposed on the second basesubstrate BS2″. The fourth insulation layer IL4″ may cover the secondactive layer ATV2″.

The second gate electrode GE2″ may be disposed on the fourth insulationlayer IL4″. The second gate electrode GE2″ may include a conductivematerial.

The fifth insulation layer IL5″ may be disposed on the fourth insulationlayer IL4″. The fifth insulation layer IL5″ may cover the second gateelectrode GE2″.

The second source-drain electrode SDE2″ may be disposed on the fifthinsulation layer IL5″. The second source-drain electrode SDE2″ mayelectrically contact the second active layer ATV2″. The second activelayer ATV2″, the second gate electrode GE2″, and the second source-drainelectrode SDE2″ may define a second driving transistor.

The sixth insulation layer IL6″ may be disposed on the fifth insulationlayer IL5″. The sixth insulation layer IL6″ may cover the secondsource-drain electrode SDE2″.

The third electrode E3″ may be disposed on the sixth insulation layerIL6″. At least a portion of the third electrode E3″ may overlap thesecond emitting area R2″.

The second pixel defining layer PDL2″ may be disposed on the thirdelectrode E3″. The second pixel defining layer PDL2″ may define a secondopening exposing a portion of the third electrode E3″. The secondopening may overlap the second emitting area R2″.

The second light emitting layer EL2″ may be disposed in the secondopening. In an embodiment, in the first emitting area R1″, the secondlight emitting layer EL2 may be removed.

The fourth electrode E4″ may be disposed on the second light emittinglayer EL2″. The fourth electrode E4″ may define a third openingoverlapping the first emitting area R1″.

The second encapsulation layer EN2″ may be disposed on the fourthelectrode E4″. In an embodiment, the second encapsulation layer EN2″ mayinclude a first inorganic encapsulation layer, an organic encapsulationlayer, and a second inorganic encapsulation layer sequentially stacked.

The color filter layer CF″ may be disposed on the second encapsulationlayer EN2″. The color filter layer CF″ may selectively transmit light ofa specific wavelength.

The first barrier pattern layer 100″ may be disposed to overlap thefirst emitting area R1″. Specifically, the first barrier pattern layer100″ may be disposed between the second base substrate B52″ and thesecond pixel defining layer PDL2″. The first barrier pattern layer 100″may include the first barrier pattern 110″. The first barrier patternlayer 100″ and the first barrier pattern 110″ may be substantially sameas the first barrier pattern layer 100 and the first barrier pattern 110described with reference to FIG. 3 and FIG. 4 . The first barrierpattern layer 100″ together with a solid portion of the sixth insulationlayer IL6 may together define a barrier pattern layer.

Light emitted from the first light emitting layer EL1″ may pass throughthe first barrier pattern 110″ and may have a relatively narrow viewingangle. Accordingly, an image having a narrow viewing angle may bedisplayed in the first emitting area R1″.

FIG. 11 illustrates an embodiment in which the first barrier patternlayer 100″ penetrates the sixth insulation layer IL6″ and is formed onthe fifth insulation layer IL5″, but the invention is not limitedthereto. For example, the first barrier pattern layer 100″ may penetratethe fifth insulation layer IL5″ and the fourth insulation layer IL4″ andmay be formed on the second base substrate B52″.

In an embodiment, in the first emitting area R1″, the second lightemitting layer EL2″ may be removed (refer to FIG. 5 ). Accordingly,light emitted from the first light emitting layer EL1″ may not passthrough the second light emitting layer EL2″.

FIG. 12 is a cross-sectional view illustrating an embodiment of astructure of a pixel included in the display device according to anembodiment. Description substantially same or similar to the descriptionwith reference to FIG. 11 may be omitted.

Referring to FIG. 12 , the second pixel defining layer PDL2″ may definean opening overlapping the first emitting area R1″. A second barrierpattern layer 200″ may be disposed in the opening. The second barrierpattern layer 200″ may include a second barrier pattern 210″. The secondbarrier pattern layer 200″ and the second barrier pattern 210″ may besubstantially same as the first barrier pattern layer 100 and the firstbarrier pattern 110 described with reference to FIG. 3 and FIG. 4 .Accordingly, a viewing angle of light emitted from the first lightemitting layer EL1″ may be adjusted by the second barrier pattern 210″,and an image having a narrow viewing angle may be displayed in the firstemitting area R1″.

Although embodiments and implementations have been described herein,other embodiments and modifications will be apparent from thisdescription. Accordingly, the invention is not limited to suchembodiments, but rather to the broader scope of the appended claims andvarious obvious modifications and equivalent arrangements as would beapparent to a person of ordinary skill in the art.

What is claimed is:
 1. A display device comprising: a first emittingarea and a second emitting area which is spaced apart from the firstemitting area; a first electrode facing a second electrode with a liquidcrystal layer therebetween, each of the first electrode, the secondelectrode and the liquid crystal layer corresponding to the firstemitting area; a third electrode facing a fourth electrode with a lightemitting layer therebetween, each of the third electrode, the fourthelectrode and the light emitting layer corresponding to the secondemitting area; the fourth electrode defining an opening in the fourthelectrode which corresponds to the first emitting area; and within thefirst emitting area, a barrier wall pattern layer spaced apart from thefirst electrode, the second electrode and the liquid crystal layer alonga thickness direction of the display device.
 2. The display device ofclaim 1, wherein the barrier wall pattern layer comprises a plurality ofbarrier wall patterns arranged spaced apart from each other on thesecond electrode.
 3. The display device of claim 1, further comprising:a pixel defining layer on the second electrode, the pixel defining layerdefining an opening which corresponds to the second emitting area and inwhich the light emitting layer is disposed, wherein the barrier wallpattern layer is between the second electrode and the pixel defininglayer.
 4. The display device of claim 2, further comprising: a pixeldefining layer on the second electrode, the pixel defining layerdefining: a first opening which corresponds to the second emitting areaand in which the light emitting layer is disposed, and a second openingwhich corresponds to the first emitting area.
 5. The display device ofclaim 4, wherein the plurality of barrier wall patterns is in the secondopening of the pixel defining layer.
 6. The display device of claim 1,further comprising: a backlight unit under the liquid crystal layer,wherein the barrier wall pattern layer is between the backlight unit andthe first electrode.
 7. The display device of claim 1, wherein thebarrier wall pattern layer comprises: a plurality of first barrierpatterns extending in a first direction and arranged in a seconddirection which crosses the first direction.
 8. The display device ofclaim 7, wherein the barrier wall pattern layer further comprises: aplurality of second barrier patterns extending in the second directionand arranged in the first direction.
 9. A display device comprising: afirst emitting area and a second emitting area which is spaced apartfrom the first emitting area; a first electrode facing a secondelectrode with a liquid crystal layer therebetween, each of the firstelectrode, the second electrode and the liquid crystal layercorresponding to the first emitting area; a third electrode facing afourth electrode with a light emitting layer therebetween, each of thethird electrode, the fourth electrode and the light emitting layercorresponding to the second emitting area; the fourth electrode definingan opening in the fourth electrode which corresponds to the firstemitting area; the second electrode and the third electrode spaced apartfrom each other along a thickness direction of the display device, and amiddle substrate between the second electrode and the third electrode,the middle substrate comprising a driving transistor electricallyconnected to the third electrode.
 10. The display device of claim 9,wherein the middle substrate defines a groove corresponding to the firstemitting area and through which light from the liquid crystal layer isemitted in a direction perpendicular to the liquid crystal layer. 11.The display device of claim 1, further comprising: a color filter layercorresponding to the first emitting area and the second emitting area,wherein light is emitted from the liquid crystal layer and the lightemitting layer, in a light emitting direction, and the color filterlayer follows the liquid crystal layer and the light emitting layer, inthe light emitting direction.
 12. A display device comprising: a firstemitting area and a second emitting area which is spaced apart from thefirst emitting area; a first electrode facing a second electrode with afirst light emitting layer therebetween, each of the first electrode,the second electrode and the first light emitting layer corresponding tothe first emitting area; a third electrode facing a fourth electrodewith a second light emitting layer therebetween, each of the thirdelectrode, the fourth electrode and the second light emitting layercorresponding to the second emitting area; the fourth electrode definingan opening in the fourth electrode which corresponds to the firstemitting area; and within the first emitting area, a barrier wallpattern layer spaced apart from the first electrode, the secondelectrode and the first light emitting layer along a thickness directionof the display device.
 13. The display device of claim 12, wherein thebarrier wall pattern layer comprises a plurality of barrier wallpatterns arranged spaced apart from each other on the second electrode.14. The display device of claim 12, further comprising: a first pixeldefining layer defining an opening in which the first light emittinglayer is disposed, and a second pixel defining layer defining an openingin which the second light emitting layer is disposed, wherein thebarrier wall pattern layer is between the second electrode and thesecond pixel defining layer.
 15. The display device of claim 13, furthercomprising: a first pixel defining layer defining an opening in whichthe first light emitting layer is disposed, and a second pixel defininglayer defining: a first opening in which the second light emitting layeris disposed, and a second opening corresponding to the first emittingarea.
 16. The display device of claim 15, wherein the plurality ofbarrier wall patterns is in the second opening of the second pixeldefining layer.
 17. The display device of claim 12, wherein the barrierwall pattern layer comprises: a plurality of first barrier patternsextending in a first direction and arranged in a second direction whichcrosses the first direction.
 18. The display device of claim 17, whereinthe barrier wall pattern layer further comprises: a plurality of secondbarrier patterns extending in the second direction and arranged in thefirst direction.
 19. The display device of claim 12, further comprising:a color filter layer corresponding to the first emitting area and thesecond emitting area, wherein light is emitted from the first lightemitting layer and the second light emitting layer, in a light emittingdirection, and the color filter layer follows the first light emittinglayer and the second light emitting layer, in the light emittingdirection.
 20. The display device of claim 9, further comprising abacklight unit which is under the liquid crystal layer and emits lighttoward the liquid crystal layer.